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1 // Copyright 2008 the V8 project authors. All rights reserved. | |
2 // Redistribution and use in source and binary forms, with or without | |
3 // modification, are permitted provided that the following conditions are | |
4 // met: | |
5 // | |
6 // * Redistributions of source code must retain the above copyright | |
7 // notice, this list of conditions and the following disclaimer. | |
8 // * Redistributions in binary form must reproduce the above | |
9 // copyright notice, this list of conditions and the following | |
10 // disclaimer in the documentation and/or other materials provided | |
11 // with the distribution. | |
12 // * Neither the name of Google Inc. nor the names of its | |
13 // contributors may be used to endorse or promote products derived | |
14 // from this software without specific prior written permission. | |
15 // | |
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
27 | |
28 #ifndef V8_JUMP_TARGET_H_ | |
29 #define V8_JUMP_TARGET_H_ | |
30 | |
31 #if V8_TARGET_ARCH_IA32 | |
32 #include "jump-target-heavy.h" | |
33 #elif V8_TARGET_ARCH_X64 | |
34 #include "jump-target-heavy.h" | |
35 #elif V8_TARGET_ARCH_ARM | |
36 #include "jump-target-light.h" | |
37 #elif V8_TARGET_ARCH_MIPS | |
38 #include "jump-target-light.h" | |
39 #else | |
40 #error Unsupported target architecture. | |
41 #endif | |
42 | |
43 namespace v8 { | |
44 namespace internal { | |
45 | |
46 // ------------------------------------------------------------------------- | |
47 // Shadow break targets | |
48 // | |
49 // A shadow break target represents a break target that is temporarily | |
50 // shadowed by another one (represented by the original during | |
51 // shadowing). They are used to catch jumps to labels in certain | |
52 // contexts, e.g. try blocks. After shadowing ends, the formerly | |
53 // shadowed target is again represented by the original and the | |
54 // ShadowTarget can be used as a jump target in its own right, | |
55 // representing the formerly shadowing target. | |
56 | |
57 class ShadowTarget : public BreakTarget { | |
58 public: | |
59 // Construct a shadow jump target. After construction the shadow | |
60 // target object holds the state of the original target, and the | |
61 // original target is actually a fresh one that intercepts control | |
62 // flow intended for the shadowed one. | |
63 explicit ShadowTarget(BreakTarget* shadowed); | |
64 | |
65 virtual ~ShadowTarget() {} | |
66 | |
67 // End shadowing. After shadowing ends, the original jump target | |
68 // again gives access to the formerly shadowed target and the shadow | |
69 // target object gives access to the formerly shadowing target. | |
70 void StopShadowing(); | |
71 | |
72 // During shadowing, the currently shadowing target. After | |
73 // shadowing, the target that was shadowed. | |
74 BreakTarget* other_target() const { return other_target_; } | |
75 | |
76 private: | |
77 // During shadowing, the currently shadowing target. After | |
78 // shadowing, the target that was shadowed. | |
79 BreakTarget* other_target_; | |
80 | |
81 #ifdef DEBUG | |
82 bool is_shadowing_; | |
83 #endif | |
84 | |
85 DISALLOW_COPY_AND_ASSIGN(ShadowTarget); | |
86 }; | |
87 | |
88 } } // namespace v8::internal | |
89 | |
90 #endif // V8_JUMP_TARGET_H_ | |
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